Alvin wants to know what his average paddling rate was for a canoe trip to a campsite. On the way there it took him 6 hours against a river current of 3 km/ hr. On the way back, the same distance took him 2 hours with the same 3 km/hr current. Let r = Alvin's average paddling rate. T t To Campsite against the current | d ' ' From Campsite with the current | d ' ' Alvin's average paddling rate was km/hour (If needed, round to 2 decimal places)